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ikpilikpil
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[upstream] Custom text renderer (erincatto/box2d#998)
Added font rendering code independent of imgui. Converted drawing code to C. `b2DebugDraw::DrawSegmentFcn` renamed to `b2DebugDraw::DrawLineFcn`.
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‎data/font.fs‎

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// SPDX-FileCopyrightText: 2025 Erin Catto
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// SPDX-License-Identifier: MIT
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#version 330 core
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in vec4 color;
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in vec2 uv;
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uniform sampler2D FontAtlas;
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out vec4 fragColor;
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void main()
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{
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fragColor = vec4(color.rgb, color.a * texture(FontAtlas, uv).r);
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}

‎data/font.vs‎

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// SPDX-FileCopyrightText: 2025 Erin Catto
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// SPDX-License-Identifier: MIT
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#version 330 core
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layout (location = 0) in vec2 aPosition;
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layout (location = 1) in vec2 aUV;
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layout (location = 2) in vec4 aColor;
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out vec4 color;
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out vec2 uv;
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uniform mat4 ProjectionMatrix;
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void main()
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{
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gl_Position = ProjectionMatrix * vec4(aPosition, 0.0, 1.0);
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color = aColor;
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uv = aUV;
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}

‎data/line.fs‎

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// SPDX-FileCopyrightText: 2025 Erin Catto
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// SPDX-License-Identifier: MIT
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#version 330
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in vec4 f_color;
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out vec4 color;
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void main(void)
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{
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color = f_color;
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}

‎data/line.vs‎

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// SPDX-FileCopyrightText: 2024 Erin Catto
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// SPDX-License-Identifier: MIT
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#version 330
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uniform mat4 projectionMatrix;
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layout(location = 0) in vec2 v_position;
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layout(location = 1) in vec4 v_color;
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out vec4 f_color;
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void main(void)
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{
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f_color = v_color;
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gl_Position = projectionMatrix * vec4(v_position, 0.0f, 1.0f);
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}

‎data/point.fs‎

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// SPDX-FileCopyrightText: 2025 Erin Catto
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// SPDX-License-Identifier: MIT
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#version 330
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in vec4 f_color;
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out vec4 color;
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void main(void)
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{
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color = f_color;
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}

‎data/point.vs‎

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// SPDX-FileCopyrightText: 2024 Erin Catto
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// SPDX-License-Identifier: MIT
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#version 330
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uniform mat4 projectionMatrix;
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layout(location = 0) in vec2 v_position;
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layout(location = 1) in float v_size;
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layout(location = 2) in vec4 v_color;
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out vec4 f_color;
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void main(void)
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{
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f_color = v_color;
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gl_Position = projectionMatrix * vec4(v_position, 0.0f, 1.0f);
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gl_PointSize = v_size;
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}

‎src/Box2D.NET.Samples/Camera.cs‎

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// SPDX-FileCopyrightText: 2025 Ikpil Choi([email protected])
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// SPDX-License-Identifier: MIT
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using System;
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using static Box2D.NET.B2MathFunction;
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namespace Box2D.NET.Samples;
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public class Camera
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public struct Camera
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{
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public B2Vec2 m_center;
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public float m_zoom;
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public float m_width;
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public float m_height;
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public Camera()
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{
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m_width = 1920;
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m_height = 1080;
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ResetView();
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}
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public void ResetView()
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{
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m_center = new B2Vec2(0.0f, 20.0f);
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m_zoom = 1.0f;
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}
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public B2Vec2 ConvertScreenToWorld(B2Vec2 ps)
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{
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float w = m_width;
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float h = m_height;
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float u = ps.X / w;
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float v = (h - ps.Y) / h;
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float ratio = w / h;
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B2Vec2 extents = new B2Vec2(m_zoom * ratio, m_zoom);
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B2Vec2 lower = b2Sub(m_center, extents);
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B2Vec2 upper = b2Add(m_center, extents);
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B2Vec2 pw = new B2Vec2((1.0f - u) * lower.X + u * upper.X, (1.0f - v) * lower.Y + v * upper.Y);
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return pw;
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}
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public B2Vec2 ConvertWorldToScreen(B2Vec2 pw)
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{
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float w = m_width;
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float h = m_height;
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float ratio = w / h;
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B2Vec2 extents = new B2Vec2(m_zoom * ratio, m_zoom);
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B2Vec2 lower = b2Sub(m_center, extents);
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B2Vec2 upper = b2Add(m_center, extents);
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float u = (pw.X - lower.X) / (upper.X - lower.X);
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float v = (pw.Y - lower.Y) / (upper.Y - lower.Y);
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B2Vec2 ps = new B2Vec2(u * w, (1.0f - v) * h);
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return ps;
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}
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// Convert from world coordinates to normalized device coordinates.
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// http://www.songho.ca/opengl/gl_projectionmatrix.html
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// This also includes the view transform
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public void BuildProjectionMatrix(Span<float> m, float zBias)
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{
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float ratio = (float)m_width / (float)m_height;
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B2Vec2 extents = new B2Vec2(m_zoom * ratio, m_zoom);
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B2Vec2 lower = b2Sub(m_center, extents);
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B2Vec2 upper = b2Add(m_center, extents);
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float w = upper.X - lower.X;
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float h = upper.Y - lower.Y;
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m[0] = 2.0f / w;
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m[1] = 0.0f;
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m[2] = 0.0f;
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m[3] = 0.0f;
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m[4] = 0.0f;
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m[5] = 2.0f / h;
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m[6] = 0.0f;
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m[7] = 0.0f;
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m[8] = 0.0f;
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m[9] = 0.0f;
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m[10] = -1.0f;
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m[11] = 0.0f;
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m[12] = -2.0f * m_center.X / w;
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m[13] = -2.0f * m_center.Y / h;
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m[14] = zBias;
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m[15] = 1.0f;
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}
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public B2AABB GetViewBounds()
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{
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if (m_height == 0.0f || m_width == 0.0f)
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{
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B2AABB bounds = new B2AABB(b2Vec2_zero, b2Vec2_zero);
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return bounds;
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}
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{
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B2AABB bounds;
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bounds.lowerBound = ConvertScreenToWorld(new B2Vec2(0.0f, (float)m_height));
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bounds.upperBound = ConvertScreenToWorld(new B2Vec2((float)m_width, 0.0f));
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return bounds;
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}
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}
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}
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public B2Vec2 center;
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public float zoom;
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public float width;
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public float height;
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}

‎src/Box2D.NET.Samples/Cameras.cs‎

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using System;
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using static Box2D.NET.B2MathFunction;
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namespace Box2D.NET.Samples;
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public static class Cameras
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{
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public static Camera GetDefaultCamera()
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{
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var camera = new Camera();
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camera.center = new B2Vec2(0.0f, 20.0f);
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camera.zoom = 1.0f;
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camera.width = 1920.0f;
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camera.height = 1080.0f;
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return camera;
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}
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public static void ResetView(ref Camera camera)
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{
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camera.center = new B2Vec2(0.0f, 20.0f);
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camera.zoom = 1.0f;
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}
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public static B2Vec2 ConvertScreenToWorld(ref Camera camera, B2Vec2 ps)
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{
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float w = camera.width;
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float h = camera.height;
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float u = ps.X / w;
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float v = (h - ps.Y) / h;
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float ratio = w / h;
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B2Vec2 extents = new B2Vec2(camera.zoom * ratio, camera.zoom);
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B2Vec2 lower = b2Sub(camera.center, extents);
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B2Vec2 upper = b2Add(camera.center, extents);
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B2Vec2 pw = new B2Vec2((1.0f - u) * lower.X + u * upper.X, (1.0f - v) * lower.Y + v * upper.Y);
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return pw;
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}
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public static B2Vec2 ConvertWorldToScreen(ref Camera camera, B2Vec2 pw)
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{
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float w = camera.width;
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float h = camera.height;
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float ratio = w / h;
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B2Vec2 extents = new B2Vec2(camera.zoom * ratio, camera.zoom);
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B2Vec2 lower = b2Sub(camera.center, extents);
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B2Vec2 upper = b2Add(camera.center, extents);
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float u = (pw.X - lower.X) / (upper.X - lower.X);
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float v = (pw.Y - lower.Y) / (upper.Y - lower.Y);
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B2Vec2 ps = new B2Vec2(u * w, (1.0f - v) * h);
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return ps;
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}
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// Convert from world coordinates to normalized device coordinates.
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// http://www.songho.ca/opengl/gl_projectionmatrix.html
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// This also includes the view transform
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public static void BuildProjectionMatrix(ref Camera camera, Span<float> m, float zBias)
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{
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float ratio = (float)camera.width / (float)camera.height;
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B2Vec2 extents = new B2Vec2(camera.zoom * ratio, camera.zoom);
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B2Vec2 lower = b2Sub(camera.center, extents);
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B2Vec2 upper = b2Add(camera.center, extents);
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float w = upper.X - lower.X;
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float h = upper.Y - lower.Y;
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m[0] = 2.0f / w;
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m[1] = 0.0f;
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m[2] = 0.0f;
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m[3] = 0.0f;
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m[4] = 0.0f;
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m[5] = 2.0f / h;
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m[6] = 0.0f;
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m[7] = 0.0f;
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m[8] = 0.0f;
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m[9] = 0.0f;
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m[10] = -1.0f;
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m[11] = 0.0f;
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m[12] = -2.0f * camera.center.X / w;
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m[13] = -2.0f * camera.center.Y / h;
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m[14] = zBias;
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m[15] = 1.0f;
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}
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public static B2AABB GetViewBounds(ref Camera camera)
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{
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if (camera.height == 0.0f || camera.width == 0.0f)
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{
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B2AABB bounds = new B2AABB(b2Vec2_zero, b2Vec2_zero);
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return bounds;
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}
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{
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B2AABB bounds;
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bounds.lowerBound = ConvertScreenToWorld(ref camera, new B2Vec2(0.0f, (float)camera.height));
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bounds.upperBound = ConvertScreenToWorld(ref camera, new B2Vec2((float)camera.width, 0.0f));
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return bounds;
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}
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}
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}

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